Apparatus for reproducing views in color.



J. K. HOLBROOK.

APPARATUS FOR REPRODUCING VIEWS IN COLOR.

APPLICATION FILED MAR. 22. 1913.

1 151 786. Patnted Aug. 31, 1915. 9 9 j v 2 SHEETS5HEET 1.

A7 A g E A? J] a I E 5 I B/ 1 E A E A E /Z a ATTORNEYS 1 K. HOLBROOK.APPARATUS FOR REPRODUCING VIEWS IN COLOR.

APPLICATION FILED MAR. 22. I913.

Patented Aug; 31, 1915.

2 SHEETSSHEET 2.

" WITNESSES: INVENTOR ATTORNEYS UNITED STATES PATENT OFFICE.

JOHN K. HOIIBROOK, OF NEWARK, NEW JERSEY, ASSIGNOR T D. S. PLUMB, OFEAST.

ORANGE, NEW JERSEY.

APPARATUS FOR REPRODUGING- VIEWS 1N COLOR.

Specification of Letters Patent.

Application filed March 22, 1918. Serial No. 756,188.

To all whom it may concern:

Be it known that I, JOHN/K. Honnnoox, a citizen of the United States,residing at and whose post-office address is No. 873 South Sixteenthstreet, Newark, county of Essex,State of New. Jersey, have inventedcertain new and useful Improvements in Apparatus for Reproducing Viewsin Color; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others sln'lledin the art to which it appertains to make and use the same.

The invention relates to the reproductionv by photography and projectionof scenes and objects appearing-in approximately their natural colors,and it particularly comprehends anorganization of reasonably inexpensiveapparatus for producing a lantern slide, .or the like, bearingphotographic im pressions of a plurality of separate images of the sceneor object, each impression being made by light rays of a particularselected color, so that the said images will have different colorvalues,and all of said images being capable of recomposition, bysuitable projecting apparatus, into a colored image of the scene orobject, without the exercise of an excessive degree of skill on the partof the operator. .To this endI provide apparatus for decomposing theimage of the scene or object into afplurality of separate substantiallylike images formed through closely associatededge portions of reversedsectors of the same lens, producing said separate imagesin diflerentcolors by interposing color screens'in thepaths of their rays, andmaking a single lantern slide contain-, ing photographicimpressions ofsaid plurality of separate and variously colored images. i

' 'The apparatus comprises'a camera provided' with a lens which consistsof recomposed reversed sectors cut from a single lens so that the edgesof the original lens meet inthe center of the re'composed lens and thediaphragm apertures'are closely associated around the center. Ihis closeassociation of the diaphragm apertures reduces stereoscopic effect inthe separate images produced to a negligible amount. The reversal of thesegments brin s the original center of the lens to a plura 'ty of pointsupon the'periph- .ery of the recomposed lens and produces a plurality ofaxes which define the separation of the plurality of images formed.

In apparatus intended for the use of the public in general it 'is notpracticable to employ an expensive camera lens which is fully correctedand it is, therefore, of great. advantage to employ a lens of the typewhich most nearly approaches the desired ldeal and which, by thedevelopment of its mode of manufacture, has become a commercial articlproducible at a cost which makes it available as an element of theapparatus under discussion. Such a lens, available at a low cost isfound to contain all the necessary corrections except that fordistortion of the red rays which are not usually made use of withordinary photographic work. By

Patented Aug. 31, rare.

making use of a projecting apparatus disclosed in this application asoriginally filed and now, by the requirement of the Patent Ofiice,presented in a division application, Serial No. 872,672 filed November18, 1914, I am enabled to correct extraneously for the distortion of thered image alone without interposing disturbing elements .in the alreadycorrected portionscof the system.

I have illustrated in the accompanying drawings apparatus embodying myinvention in a manner well suited to a clear understanding of theworking thereof, Figure 1 being a central horizontal section of thecamera which I employ; Fig. 2, a section on'line 22 of Fig. 1; Fig. 3, asection on l1ne 3 3 of Fig. 1; (Figs. 4, 5, 6 and 7, four views showingsteps in the construction of one element of the camera lens and Fig. 8,a view in perspective of the assembled camera lensshowing the lens tubebroken away.

Referring to the drawings, the camera lens "is made up of elements awhich are, in ordinary lenses, of the circular shape shown in Fig. 4. Iprefer to first grind the edges of these elements a to thehexagonal formshown in Fig. 5 and then cut them into segments 6, c, d as indicated inFig. 6. The

arrows shown in Figs. 4, 5, 6 and 7 indicatethe position of the lensmaterial in these views. It will be noted thatthe segments 6, 0,,and d(Fig. 6) areoof a regular diamond shape, their inner cut edges beingidentical as regardsv length and angle with their outer ground. edges. Inow reverse these segments 6, a and d bringing their outer ground edgestogether and cement them, recomposing the lens in hexagonal. form withthe edge portions of the original element a at the center of therecomposed lens element and the central portions of the original elementa at three equidistant points on the edge of the recomposed lens 4element. In grinding the hexagonal shape upon the edge of the originallens element a and three lea-fed partitions e interposed be? tween thespaced elements to avoid the crossing of light. This assembly of thehexagonal lens elements in a hexagonal lens tube maintains the severalsectors of the several lens elements in alinement. The lens tube .f isthen preferably mounted in a hexagonal sleeve g, the hexagonal form ofwhich prevents the lens tube from rotating but permits it-to slideaxially for focusing. The lens tube and its sleeve may be provided withthe usual rack and pinion device for producing axial movement of thelens tube in focusing. The camera box A shown in Figs. 1, 2, and 3 is ofthe usual type, and it is provided with a plate holder B which may beinserted and withdrawn,

being held in the camera plates by a spring clip C. From a point justback of the lens Ltube fpartitions D are so arranged that their forwardends coincide with the lines of juncture of the sectors of the lens topre'-,

vent stray rays of light'passing through one sector from crossing to thefield of another sector. The rearward ends of the partitions D engagepartitions E which exercise the same functions and extend back- .wardlyto within a short distance of the ground glass shown atE' in Fig. 1 andwhich occupies a position identical with that of the plate when theplate holder is inserted. The partitions E divide the, surface oftheplate into three parts upon each of which one ofthe colored images fromthe lens falls. 3 -The diflerent color values may be obtained bycoloring the lens segments 6, 0 and d, or an additional screen may beprovided, such as shown at i. a

- The diaphragm h which is located within the lens tube has threeapertures one opposite each sector ofthe lens, and these apertures areplaced as closely together and to the center of the lens as ispracticable. The areas of these apertures in the diaphragm areproportioned one to another in such a 'way that the amount of lightnecessary for each of the colored images to be properly impressed uponthe plate will be admitted by a single exposure, that is by the removalof the ca from the lens simultaneously admlttlng light to all threediaphragm apertures and the subsequent return of the cap simultaneouslycutting off the light from all three diaphragm apertures.

When an exposure has been made upon a plate in this way, the plate upondevelopment will give a negative containing three "pictures produced bythe green and violet .or the blue and yellow lights, and this is sobecause the l ensis-not usually corrected for the red and orange as thecolors do not play an active part in the usual photographic processes.This distortion may, however,

bodying the invention disclosed in my copending application abovereferred to.

It will be obvious that but; two pictures may be taken upon a slide ormore than threewhen the colors are chosen to produce the color efi'ectsdesired.

What I claim is:

1. Ina camera. for use in the reproductionof scenes and objects in colorby photography and projection, a lens tube and a lens associatedtherewith and made up of recomposed and closely positioned reversedsectors of a given lens,whereby the normal image of such given lens isdecomposed into a plurality of separate but closely associated images.

2. In a camera for use in the reproduction of scenes and objects incolor by photography and projection, a lens made up of recomposedreversed sectors of a given lens, and color screens interposed in thepaths of the image-forming light rays passing through the severalsectors, whereby the normal image of such given lens is decomposed intoa plurality of separate but closely associated images of difierent colorvalue.

3. In a camera for use in the reproduction of scenes and objects incolor by photography and projection, a lens made up 0 recomposedreversed sectors of a given lens, color screens interposed in the pathsof the image-forming light rays passing through the several sectors, anda diaphragm having a plurality ofaperturescorresponding to the pluralityof sectors, the areas of theseveral apertures being proportioned to oneanother in accordance with the amount of light required for the severalcolored images, whereby the normal image of such given lens is becorrected by projecting apparatus emdecomposed into a plurality ofseparate but closely associated images of difierent color value andappropriate relative intensity.

4:, A camera for use in the reproduction of scenes and objects in colorby photography and projection, having means for dividing a beamv oflight from the scene or object into a plurality of slightly separatedbeams and for screening from each of the separate beams light rays ofdifferent colors,

to form a plurality of separate but closely associated images ofdifferent color value, said dividing means compr sing a lens made up ofrecomposed reversed sectors of a given ilens, "substantially asdescribed.

, radially contiguous, said sectors being capable of producing separateimages, for the purpose described.

In testimony whereof I aflix my signa ture,"in presence of twowitnesses.

JOHN K. HOLBROOK. I

Witnesses:

M. A. Em, C. B. SCHROEDER.

